Security system using mobile phone

Abstract

A security system is provided that uses a video processor of a video mobile phone to detect a moving object, and includes a video mobile phone for capturing external images and determining changes from the external images, transmitting alarm signals and compressing to transmit alarm video frames; an alarm generator for receiving alarm control signals from the video mobile phone to alarm; and an alarm video storage device for receiving and storing the alarm video frames transmitted from the video mobile phone.

What is claimed is:  
     
         1 . A security system comprising: 
 a video mobile phone having a security function for capturing external images, determining changes from previous external images, and transmitting alarm control signals and alarm video frames responsive to the determined changes;    an alarm generator in signal communication with the video mobile phone for receiving the alarm control signals from the video mobile phone and generating an alarm; and    an alarm video storage device in signal communication with the video mobile phone for receiving and storing the alarm video frames transmitted from the video mobile phone.    
     
     
         2 . The security system of  claim 1 , wherein the video mobile phone comprises: 
 a video input device for capturing and inputting external images into the video mobile phone;    a video processor for comparing video frames inputted from the video input device to generate result values and compressing the alarm video frames according to control signals; and    an alarm controller for generating control signals to control the alarm according to the result values generated by the video processor.    
     
     
         3 . The security system of  claim 2 , wherein the video processor comprises: 
 a video storage device for storing at least one of captured video frames inputted from the video input device and sampled video frames;    a video comparator for comparing the video frames stored in the video storage device to generate result values; and    a video converter for compressing and transmitting the video frames according to control signals from the alarm generator.    
     
     
         4 . The security system of  claim 3 , wherein the video comparator compares the sum of absolute values of differences between the pixel luminance of a current video frame and the pixel luminance of a stored arbitrary video frame with a threshold value defined by an user, thereby generating result values.  
     
     
         5 . The security system of  claim 2 , wherein the video processor comprises: 
 a video converter for converting the inputted video to generate alarm video according to control signals from an alarm controller and decoding the converted video frames;    a compressed video generator for generating compressed video with video signals generated during decoding by the video converter; and    a video comparator for comparing the compressed video to generate the result values.    
     
     
         6 . The security system of  claim 5 , wherein the compressed video is produced with a DC coefficient selected from the decoding and a motion vector.  
     
     
         7 . The security system of  claim 5 , wherein the video comparator compares the sum of absolute values of differences between the pixel luminance of a current video frame and the pixel luminance of a stored arbitrary video frame with a threshold value defined by an user, thereby generating result values.  
     
     
         8 . A method of securing using a video mobile phone having a securing function, comprising the steps of: 
 a) setting a security mode and a threshold value with the securing function as a basis for determining whether there is motion relative to the video mobile phone;    b) inputting external images captured with a camera of the video mobile phone into the video mobile phone in the set security mode;    c) processing video frames for at least one of compressing and storing the inputted video frames and comparing the video frames to generate result values;    d) signaling an alarm according to a result of comparing the video frame; and    f) transmitting the alarm video frames inputted to the video mobile phone to a storage device.    
     
     
         9 . The method of  claim 8 , wherein step c) compares the sum of absolute values of differences between the pixel luminance of a current video frame and the pixel luminance of a stored arbitrary video frame with a threshold value defined by a user, thereby generating result values.  
     
     
         10 . The method of  claim 9 , wherein the video frames are originally captured images.  
     
     
         11 . The method of  claim 9 , wherein the video frames are image frames obtained by sampling originally captured images.  
     
     
         12 . The method of  claim 9 , wherein the video frames are image frames compressed from originally captured images.  
     
     
         13 . A security system comprising: 
 a video mobile phone;    an alarm video storage device in signal communication with the video mobile phone; and    an alarm generator in signal communication with the video mobile phone.    
     
     
         14 . A security system as defined in  claim 13 , further comprising a program storage device defining program steps for: 
 setting a security mode;    receiving video frames responsive to the set security mode;    at least one of comparing and processing the received video frames;    detecting movements responsive to the received video frames;    signaling an alarm responsive to the detected movements; and    storing received video frames relevant to the signaled alarm.    
     
     
         15 . A security system as defined in  claim 13 , the video mobile phone comprising: 
 a video input device;    a video processor in signal communication with the video input device; and    an alarm controller in signal communication between the video processor and the alarm generator.    
     
     
         16 . A security system as defined in  claim 15 , the video processor comprising: 
 first and second input terminals;    a video converter in signal communication with the first and second input terminals;    a video storage device in signal communication with at least one of the first and second input terminals; and    a video comparator in signal communication with the video storage device.    
     
     
         17 . A security system as defined in  claim 16 , the video converter comprising: 
 a variable length decoder;    a motion compensator in signal communication with the variable length decoder;    an inverse quantization unit in signal communication with the variable length decoder;    an inverse discrete cosine transformer in signal communication with the inverse quantization unit; and    a summing unit in signal communication with the inverse discrete cosine transformer and the motion compensator.    
     
     
         18 . A security system as defined in  claim 15 , the video processor comprising: 
 a video converter;    a compressed video generator in signal communication with the video converter; and    a video comparator in signal communication with the compressed video generator.    
     
     
         19 . A security system as defined in  claim 18 , the video converter comprising: 
 a variable length decoder;    a motion compensator in signal communication with the variable length decoder;    an inverse quantization unit in signal communication with the variable length decoder;    an inverse discrete cosine transformer in signal communication with the inverse quantization unit; and    a summing unit in signal communication with the inverse discrete cosine transformer and the motion compensator.    
     
     
         20 . A security system as defined in  claim 19  wherein the compressed video generator is in signal communication with the variable length decoder and the inverse quantization unit.